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Maven Example

We can create a simple maven example by executing the archetype:generate command of mvn tool.

To create a simple java project using maven, you need to open command prompt and run the archetype:generate command of mvn tool.

Syntax

The syntax to generate the project architecture is given below:

mvn archetype:generate -DgroupId=groupid -DartifactId=artifactid 
-DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=booleanValue

Example

The example to generate the project architecture is given below:

mvn archetype:generate -DgroupId=com.javatpoint -DartifactId=CubeGenerator 
-DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

Note: Here, we are using maven-archetype-quickstart to create simple maven core project. if you use maven-archetype-webapp, it will generate a simple maven web application.

Output

Now it will generate following code in the command prompt:

mvn archetype:generate -DgroupId=com.javatpoint -DartifactId=Cub
eGenerator -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=fa
lse
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> maven-archetype-plugin:2.2:generate (default-cli) @ standalone-pom >>
>
[INFO]
[INFO] <<< maven-archetype-plugin:2.2:generate (default-cli) @ standalone-pom <<
<
[INFO]
[INFO] --- maven-archetype-plugin:2.2:generate (default-cli) @ standalone-pom --
-
[INFO] Generating project in Batch mode
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/archetypes/mav
en-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.jar
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/archetypes/mave
n-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.jar (5 KB at 3.5 KB/se
c)
Downloading: http://repo.maven.apache.org/maven2/org/apache/maven/archetypes/mav
en-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.pom
Downloaded: http://repo.maven.apache.org/maven2/org/apache/maven/archetypes/mave
n-archetype-quickstart/1.0/maven-archetype-quickstart-1.0.pom (703 B at 0.9 KB/s
ec)
[INFO] -------------------------------------------------------------------------
---
[INFO] Using following parameters for creating project from Old (1.x) Archetype:
 maven-archetype-quickstart:1.0
[INFO] -------------------------------------------------------------------------
---
[INFO] Parameter: groupId, Value: com.javatpoint
[INFO] Parameter: packageName, Value: com.javatpoint
[INFO] Parameter: package, Value: com.javatpoint
[INFO] Parameter: artifactId, Value: CubeGenerator
[INFO] Parameter: basedir, Value: C:\Users\SSS IT
[INFO] Parameter: version, Value: 1.0-SNAPSHOT
[INFO] project created from Old (1.x) Archetype in dir: C:\Users\SSS IT\CubeGene
rator
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 10.913s
[INFO] Finished at: Thu Dec 26 16:45:18 IST 2013
[INFO] Final Memory: 9M/25M
[INFO] ------------------------------------------------------------------------
'cmd' is not recognized as an internal or external command,
operable program or batch file.

Generated Directory Structure

Now go to the current directory from where you have executed the mvn command. For example: C:\Users\SSS IT\CubeGenerator. You will see that a simple java project is created that has the following directory:

CubeGenerator
-src
--main
---java
----com
-----javatpoint
------App.java
--test
---java
----com
-----javatpoint
------AppTest.java
-pom.xml

As you can see, there are created 3 files pom.xml, App.java and AppTest.java. Let's have a quick look at these files:

1) Automatically Generated pom.xml file

<project xmlns="http://maven.apache.org/POM/4.0.0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>
  <groupId>com.javatpoint</groupId>
  <artifactId>CubeGenerator</artifactId>
  <packaging>jar</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>CubeGenerator</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
</project>

2) Automatically Generated App.java file

package com.javatpoint;
/**
 * Hello world!
 *
 */
public class App 
{
    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );
    }
}

3) Automatically Generated AppTest.java file

package com.javatpoint;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
/**
 * Unit test for simple App.
 */
public class AppTest 
    extends TestCase
{
    /**
     * Create the test case
     *
     * @param testName name of the test case
     */
    public AppTest( String testName )
    {
        super( testName );
    }
    /**
     * @return the suite of tests being tested
     */
    public static Test suite()
    {
        return new TestSuite( AppTest.class );
    }
    /**
     * Rigourous Test :-)
     */
    public void testApp()
    {
        assertTrue( true );
    }
}

Compile the Maven Java Project

To compile the project, go to the project directory,

for example: C:\Users\SSS IT\CubeGenerator and write the following command on the command prompt:

mvn clean compile

Now, you will see a lot of execution on the command prompt. If you check your project directory, target directory is created that contains the class files.


Run the Maven Java Project

To run the project, go to the project directory\target\classes,

for example: C:\Users\SSS IT\CubeGenerator\target\classes and write the following command on the command prompt:

java com.javatpoint.App

Now, you will see the output on the command prompt:

Output of the maven example

Hello World!

How to build the maven project or how to package maven project?

The mvn package command completes the build life cycle of the maven project such as:

  1. validate
  2. compile
  3. test
  4. package
  5. integration-test
  6. verify
  7. install
  8. deploy

Visit this link to know more about build life cycle http://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html

You need to execute the following command on the command prompt to package the maven project:

mvn package

Now you will see that a jar file is created inside the project/target directory.

You can also run the maven project by the jar file. To do so, go to the maven project directory, for example: C:\Users\SSS IT\CubeGenerator and execute the following command on the cmd:

java -classpath target\CubeGenerator-1.0-SNAPSHOT.jar;.; com.javatpoint.App

Now you will see the following output:

Hello World!




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